I have a V70 1998 which I use for caravan towing. I would like to know where the power to the split charge relay can be found, I believe this to be in place and there is a fuse for it in the main fuse box. I believe mine is not correctly connected. Also when connected to the caravan all lights operate correctly until I switch on headlights when I lose all lights. I can find no fault on the caravan lights which work normally when on my other car. Any advice gratefully received.